Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
thuc dan » thuc hanh, hoc dan, thuc vat
thanh ve » hanh ve, thanh va, thanh vien
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
na thuc » nam thuc, na thuoc, va thuc
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ve cua » le cua, de cua, te cua
cua te » cua tu
ve na » ve nha, ve va, le na

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((y nang) or (v nang)) xa hoi. hieu ve na thuc dan thanh ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((y nang) OR (v nang)) xa hoi. hieu ve na thuc dan thanh ve cua te.
• Adding a wildcard symbol may retrieve word variants: vu sach ((y nang) or (v nang)) xa hoi. hieu ve na thuc dan thanh ve cua te*.